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u in (-oo:+oo)
(1/2)*u-6 = 2-3*u // - 2-3*u
(1/2)*u-(-3*u)-6-2 = 0
(1/2)*u+3*u-6-2 = 0
7/2*u-8 = 0 // + 8
7/2*u = 8 // : 7/2
u = 8/7/2
u = 16/7
u = 16/7
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